#define  _CRT_SECURE_NO_WARNINGS 1void Qpop(Queue* p)
{
	assert(p);
	assert(p->size);

	if (p->phead->next == NULL)
	{
		free(p->phead);
		p->phead = p->tail = NULL;
	}
	else
	{
		QNode* next = p->phead->next;
		free(p->phead);
		p->phead = next;
	}
	p->size--;
}